[Bug middle-end/26001] [4.1/4.2 Regression] expand uses the wrong part of the string for array accesses

["tobi at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #14 from tobi at gcc dot gnu dot org  2006-01-30 19:37 -------
(In reply to comment #13)
> (In reply to comment #12)
> > > this (t02.original) looks like a possible off-by-one error.
> > 
> > [1] here is correct, the arrary bounds is 1:1 and not the C array bounds
> > starting at 0.
> 
> I should mention the off by the one error is in expand, where it forgets to
> take into account the lower bound of the array.

(In reply to comment #13)
> (In reply to comment #12)
> > > this (t02.original) looks like a possible off-by-one error.
> > 
> > [1] here is correct, the arrary bounds is 1:1 and not the C array bounds
> > starting at 0.
> 
> I should mention the off by the one error is in expand, where it forgets to
> take into account the lower bound of the array.

Sounds like the tree-optimizers should have replaced "0"[1] with '0'.  This
also sounds like it was pure chance that the bug didn't trigger at -O0.

> I will be fixing this after my current bootstrap/test finishes for a different
> expand bug.

Thanks.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26001